Twyer.



W. D. ROSS, JIII TWYER.

APPLICATION FILED MAY 6, 1916.

1,205,568. Patented Nov. 21, 1916.

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W. D. ROSS, JR. TWYER.

APPLICATION FILED MAY 6. 19I6.

1,205,568. Patented Nov. 21, 1916 2 SHEETS-SHEET 2.

UNITED STATES PATENT onrion.

WALTER D. ROSS, JR., OF ANNISTON, ALABAMA.

'rwY En.

To all whom it may concern Be it known that I, IVAL'rnn D. Ross, J r., acitizen of the United States, residing at Anniston, in the county ofCalhoun and State of Alabama, have invented certain new and usefulImprovements in Twyers, of which the following is a specification.

This invention relates to twyers and has for its object the provision oftwyers of simple construction by which the air blast will be directedpositively to the center of the furnace.

Another object of the invention is to so construct the twyer that aburnt out part' may be readily removed without necessitating areconstruction of the entire furnace, and a still further object of theinvention is to so construct the lower twyer that the charge will bedirected away fromthe mouth of the twyer and a heavy lining may beemployed. V

The invention also seeks to provide a lower twyer so constructed thatthe air blast will be furnished a wide'passage and at the same time thestreams of air will be caused to. converge toward the center of thefurnace.

In the accompanying drawings: Figure 1 is a vertical section of thelower portion of a cupola furnace showing my improved twyer in positionthereon; Fig. 2 is a horizontal section of aportion of the furnace takenjust above the lower twyer; Fig. 3 is a detail view showing the severalparts of the lower twyer in perspective and disassembled butapproximately in their proper relative positions; Fig. 4 is a detailperspective view of the upper twyer.

The cupola furnace 1 may be of any well known or preferred constructionand will be equipped with the usual annular inclosing air box 2connected by a conduit 3 with a source of air under pressure.

In carrying out my invention, I secure in the wall of the furnace, atthe outer surface thereof, a ring or circular shell 4. At intervalsaround the shell are base plates 5 which are preferably circular and areprovided with openings 6 through which cap screws or other fasteningdevices may be inserted into the shell, as will be readily understood.On its inner side, eachoof'these base" plates is constructed with anannular enlargement or rib 7 around its central bore 8 and at thejunction of said rib with the wall of the bore is asmall beveled portion9. The nozzle or Specification of Letters Iatent.

Application filed May 6, 1916. Serial No. 95,948.

PatentedNov. 21, 1916.

and they will be spaced equidistantly around I the furnace so that anequal distribution of the air blast will be effectedf It will be readilynoted that the base plate 5 is not a permanent part of the furnacestructure so that it can be readily detached anda burnt out tube ornozzle easily withdrawn when necessary. It will also be noted that aclear passage is provided through the outer surface of the furnace tothe inner surface of thesame so that, if the inner end of the twyershould become choked, the obstruction can be very readily removed.Inasmuch as the twyers are inclined downwardly and inwardly, the chargeis not apt to enter and collect in the inner end of the twyer so thatthe liability of the twyer to choke is minimized.

The lower twyers are disposed in a horizontal radial plane of thefurnace and are also-provided in sufficient number to permit theentrance of an. air blast through the entire circumference of thefurnace. The lower twyers will preferably be provided in six sections,each of which will be composed of a number of separate elements, andordlnarily six sections or individual twyers will be sufiicient to filla horizontal radial plane of the furnace. In constructing each lowertwyer, I employ alower twyer plate or base plate 12 which will be ofarcuate form viewed in plan, but flat when viewed from the side or endand at the ends of this base plate or lower twyer plate, I formupstanding lugs or posts 13 which are of greater extent longitudinallyof the plate at their outer ends than at their inner ends, the innervertical wall 14 of each lug or post being curved so that an air passagewill be provided widerat its inner end than at its outer end. Restingupon the lugs or posts 13 and bridging the space between the same is anupper twyer plate 15 which is provided in its lower side with alongitudinal recess 16 having its ends curved, as shown at 17, tocorrespond to the curved walls 14 of the lugs or posts 13. This recesstapers toward its outer end so that at the outer edge of the plate thesurface of the recess will be flush with the surface of the plate. Uponthe lower twyer plate 12, at the center of the same, is a division block18 which extends up to the upper plate 15 and has its outer surfaceconvex, as shown at 19, so that the entering stream will be divided, asindicated by the arrows in Fig. 2. The convex wall of the division block18 is opposed to the concave walls 14 so that, as the air passes throughthe twyer, it will not only be divided but the branches of the streamwill be given a whirling action so that they will tend to convergetoward the center of the furnace, as will be readily understood onreference to the arrows in Fig. 2. The sections or twyers may bearranged with the endsof adjacent plates 12 abutting, but I prefer toemploy the wedge-shaped spacing blocks 20 between adjacent twyers. Thelower twyer plate 12 is placed directly upon a portion of the wall ofthe furnace, but I interpose between the upper plate 15 and the furnacewall, segmental filling blocks 21 which conform to the curvature of theWall and serve as supports for the upper portion of the wall above thetwyer. These filling blocks are of such size that two of the blocks willcover the rear half of the upper twyer plate 15 and will extend from themedial vertical plane of one spacing block 20 to the similar plane ofthe spacing block at the opposite end of the twyer. Upon the inner halfof the twyer 15, I place the segmental filling and supporting blocks 22which are of such form and size as to project beyond the inner end ofthe twyer and thereby furnish a support for the upper wall which may bethicker than the wall below the twyers so that it will overhang thetwyer and thereby direct the charge toward the center of the furnace andaway from the twyer. The overhanging portion of the filling blocks 22are beveled upon their under sides, as shown at 23, so that spreading ofthe air blast will be facilitated. Between the filling blocks 22 anddirectly over the spacers 20, are spacers 24, similar in form to theblocks 22. The overhanging portions of the blocks 22 and 24 enable thebuilder of the furnace to employ a heavy lining just above the twyer sothat the life of the furnace will be prolonged.

Inasmuch as the furnace wall, immediately above the lower twyer isthicker than the wall below the twyer, the charge will be clirected awayfrom the inner openings in the twyers and, consequently, will not be aptto collect in and choke the same. Should choking of the twyer occurthrough the flow of the metal, the obstruction can be easily re moved bythe use of a pinch bar or similar instrument. It will be readily notedthat each twyer or twyer section has a single entrance opening for theair at its outer side and has two discharge openings at its inner side.The air will thus be divided into two streams as it flows through thetwyer and these streams will be caused to converge toward the center ofthe furnace without losing any of their velocity. The several sectionsof the twyer are not secured together but are held together by theemplacement of the same within the furnace wall and should any one partbe worn out, it may be readily removed and a new part substitutedtherefor without requiring a dismantling of the entire furnace or theprovision of an entire new twyer or new set of twyers. The downward andinward inclination of the upper twyer causes the air to escape therefromin a downwarddirection so that any tendency of the same to risethrough-the furnace will be resisted and the force of these air currentswill aid in directing the descending charge away from the lower twyer.Moreover, this inclination of the upper twyers will aid in directing theair blast to the point where it will most effectually accomplish thedesired ends.

My twyers are exceedingly simple in their construction and may bereadily applied to.

any cupola furnace. The blocks 22 and 24, which are exposed to thegreatest heat, are very easily replaced when burnt off. The spacingblock 24, being small, can be easily removed and the block 22 will thencome out.

Having thus described the invention, what is claimed as new is:

1. A twyer consisting of upper and lower arcuate plates, the lower plate.having posts at its ends to support the upper plate, said posts havingconcave inner end surfaces, and a division block fitted between the saidupper and lower plates between and spaced from the said posts and havingits outer wall convex and opposed to the concave walls of said posts.

2. A twyer consisting of a base plate, posts at the ends of saidbaseplate, an upper plate resting upon said posts and bridging the spacebetween them and having a shallow recess in its lower side extendingfrom post to post, and a division block between the base plate and theupper plate intermediate the said posts.

3. The combination of a plurality of arcnace, of a twyer consisting ofupper and lower members constructed to provide a passage therebetweenand set into the wall of the furnace, filler blocks set into the wall ofthe furnace and resting upon the said upper plates, and other fillerblocks set into the wall of the furnace and resting upon the upper twyerplates at the inner edges thereof and bearing against the inner surfacesof the first-mentioned filler blocks, the second-mentioned filler blockshaving their inner edges overhanging the twyers.

5. The combination with a cupola fun nace, of twvers consisting of upperand lower plates constructed to provide diverg- Gopies of this patentmay be obtained for five cents each, by addressing the ing air passagesbetween them, filler blocks resting upon the upper twyer plates at theouter edges of the same and other filler blocks resting upon the uppertwyer plates and against the inner walls of the first-mentioned fillerblocks, the second-mentioned filler blocks overhanging the twyers and being beveled on their under sides at their inner ends, the several fillerblocks and the twyer plates being set into the wall of the furnace.

In testimony whereof I afiix my signature.

WALTER D. ROSS, JR. a 8.

Commissioner of Patents,

Washington, D. C.

